Not sure if I'm in the best position to be dispensing advice, but if you're trying to pick up adc, a couple things. Like the previous person that commented, farming is really, really important. Even if you can't manage to get a kill, being around 15-20 CS ahead of your opponent is like having a kill over them. If you need help with that, try going into a custom and just working on your cs. Might be helpful to just remove any extra AD so you get used to csing without additional help from items. Same as what the other person mentioned, watch for mistakes in your opponents. Try to hold onto some of your mana as well; your opponents can capitalize on that and you may end up dead faster than you think. Also, stay safe when it gets to teamfighting. You're not a mid laner, don't try to pull something crazy and go after someone in an attempt to kill them unless you're confident in your ability to pull it off. Stay back, even if it means all you can do is hit the tank. It's better than getting immediately destroyed due to your inescapable squishyness.
Since it looks like you're trying to pick up Kalista, work on communicating with your support. Her ult is extremely reliant on your support not panicking and just jumping back into the enemy team when you're trying to save them. I also suggest you read the two stickied posts (if you haven't read them before) seeing as one is about Kalista and the other just contains helpful information in general.
Now for support, it looks like sometimes you're forgetting to swap out your warding totem trinket for the sweeping one once you get your sightstone. It's pretty important that you do this so you can clear out wards if you want to be able to have someone pull off a good gank. Also, when you have swapped out your trinket, use it. I can't tell from your match history how many times you've used it, but it seems like you've been finding few, if any, of the enemy wards. And stemming from my own experiences, that usually happens when I forget to use it. ._. Just try to remind yourself that it's there. Also, I see you're just buying around 1 pink ward each game, and unless nobody's ever found your ward, I'm pretty sure you should consider getting more when it's destroyed. Even if your ward hasn't been discovered, it might be more advantageous to buy another and move it as the game progresses, even if it puts it at a higher risk of getting found and destroyed.
Also, your match history doesn't tell me your behavior within games, but that's a pretty important part of the game. Try to keep a level head and if someone's just giving you grief about everything, mute them. However, keep an ear open for any valid criticism in their statements, like if you need to be staying further back or something like that.
Feel free to call me out on any of my advice, like I said, I'm not sure if I'm the best person to be giving it. It's sometimes quite difficult for me to follow my own advice, even if I know I should, and I'm not particularly highly ranked either. If you're curious about my ranking, I ended last season in S4, haven't touched ranked this season yet.
, I build them tanky. So I recommend you to build them tanky, since you're not the main damage dealer. Items I would recommend: 
I build Tankmi, Tankna. NO EXCEPTIONS. They'd think "lol Nami so squishy xdddd" but actually I'm a bodyguard. Don't judge a book by its cover.
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. Never Bloodthirster. Never first item Bloodthirster on any ADC. NEVER. Like, 
on a support, finish this item to 
ASAP.