Help for adding stamps to blog?

Im not that good with tech and i used someone else preset theme and im trying to add stamps to my blog but i cant quite get it to work and im just assuming it may have something to do with the fact im using a blog format right now ive tried putting the codes from this person in for the photos at the very bottom of my about me https://blog.spacehey.com/entry?id=368961 and the blog theme im using is this one. https://layouts.spacehey.com/layout?id=1169 

If someone can explain it really simply for me that would be lots of thanks ^^ Thank you for reading :')

Edit:

Example of stamps i wanna use: