I need a help to do my app

I want to create an app that logs into the discord account and you choose the groups of the servers that you want it to download the images automatically, but I can not do that, I was able to put a web viewer to login, but after that I do not know how to do more anything.
Can someone help me???

Show us what you’ve done so far.

I can make an app. PM me for more details.