Hi @tenshi.cg! I can confirm that there is a user with the username Tenshi. Do you have any other name you would like to use. I could change it for you if you want to.
As for your profile picture, you might have to try clearing your browser's cache and cookies before trying to upload it again or try to upload it from a different browser. Otherwise you can try uploading it a smaller size image and see if it works.
As for the last issue, it seems like deleting your cache and cookies would be the solution. Let me know if it works!