Hi, I'm Jesper, and my pronouns are they/them.
Here are some examples how you can use them:
They went pineapple shopping.
I went with them.
They brought their pineapple slicer.
I think it was theirs.
They used the pineapple slicer themselves.
If you're curious, you can read more about the singular they and its long history in the English language.