New and I have a few questions

Hello! I've just started on Dscout this week and have been enjoying applying for missions. I've ran into a few things I can't seem to find the answer for by searching online and thought maybe someone here would be kind enough to help!

These are the questions I have:

1. This is probably a dumb question, but I've noticed when looking at missions, at the bottom of each one is the application button and a "thumbs down" button. Is the thumbs down just to remove it from your list? I haven't used it just in case it's some kind of downvote or something. But I would love to clear away the missions I'm not a good fit for.

2. I was prompted to sign up for XT, and I did in an effort to have a chance at more missions/qualifying easier, but this morning my phone randomly downloaded 3 games without my knowledge. I only noticed when I got a notification that they were downloaded. It might not be connected but I now feel uneasy about XT and want to opt out but I can't find how to do that. I've looked through the help section on Dscout and Googled it. Does anyone know how I can do this?

3. I've received an invitation through email but it's one I can't do because it's located in Washington DC. The email says to apply. Do I need to refuse/cancel the invitation, or is simply not applying sufficient?

Thanks so much for any help!