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I am having a hard time putting the delete key back after removing It to remove something Inside… Im able to connect It back on but It stays flat and cannot press so It will work. I dont see what Im doing wrong..any Ideas?

Given the age of the system I would just go to an Apple Store or authorized service center to have if fixed. Both the butterfly and the newer (older) magic keyboard (scissor design) are tricky to pop off as well as installing it back on without breaking it. Most will fix it for you under warranty Keyboard Service Program for MacBook, MacBook Air, and MacBook Pro Your only other option is to get a replacement key cap as you hadn’t given us the exact model I can only give you the start page you’ll need to drill down as needed TheBookYark - Key Caps