You can post your images to a picture hosting webside (I personally use imgur), then you paste the link to the image followed by this: [img/]
Try restarting your client and see if it's fixed. If that doesn't fix it, the only thing you can really do is submit a ticket at https://support.riotgames.com/hc/en-us
I'd say you could try running the repair function, but I don't think that's gonna fix it, and it'll just waste a bunch of your time. You aren't the first one to say that their ward is missing though.