Not sure if this will help, but here goes!
I assume you have saved the 'gif' you are trying to insert into the document?
Go to the 'Insert' tab and down to the 'picture' tab, it should open a sub folder containing 'From File', 'From ClipArt' etc..., chose, from file. Then find the file the gif is in, and open or 'attach' it, and your gif should be in your Doc!
Good luck
GG