1. What file extention do your screenshots have (JPG, PNG, etc.)? Have you uploaded them to this page?
2. You would add them just like any other text/item. Click where the image should go, then click "Photo" under the "Add Features and Media" tab on the right side of the editor. In the VisualEditor, there should be a little icon that looks like a picture on the toolbar at the top of the edit window. You can upload pictures there or search for ones you've already uploaded.
Check out your Admin Dashboard, which can be found by clicking "Admin" on the bottom toolbar. It has links to all your new tools. Please let me know if you have any questions, and good luck with the wiki!
Unfortunately, I don't have much control over who gets blocked for what. It's important to go over the Wiki Editing Guidelines before you edit pages; some of the stuff you added was inaccurate or didn't make sense to put on the pages. We've had trolls and spammers in the past so I'm honestly not surprised you were blocked, but you should probably get ahold of LGCFM yourself to make an appeal. I'm not really on the team to make these kinds of decisions; I'm not even a moderator.