PBE Signup Change

I made a application for PBE like right after I hit level 30 in LoL so... I had no main and was just sort of random and typed a bunch of random stuff. So now I pretty much main ADC and kind of would like to put that in PBE since I know ADC is in a strange place at this point in S7, and I've been playing Kalista a ton and MAIN Draven, so I was kind of wanting to WRITE that in PBE Application. The issue is, I already made an application a long time ago... So is there a way you can reset your application? Change it in any way? If not, I truly think there should be because I am probably to toxic to get into testing, but I know friends who could help out and submitted applications the same time I did, and their mains have changed as well so, it'd be nice to refresh Riot on our status because we would love to be able to test new updates before they come out and legitimately consider the champion and the design, balance issues ect, rather than saying "BROKEN ASF" like I always see on YouTube clickbaits...

Edit; If I made it on PBE, and also began recording new content before it released on LoL, I would title the video overviewing strong champions as "Slightly overpowered in certain matchups, but not incredibly strong compared to some picks"