Hey im trying to add html in blocks and it never shows up or it just shows the code. I got php-nuke 8.1
I try doing add a block in the adminstrator becuse I dont know how to make a block myself.

Can you show us your code?

I'm guessing you're trying to paste some kind of javascript in it?
Nuke's stupid security restrictions won't allow it, even for admins.

Try this... Create an empty block.
Then go into the database using phpMyAdmin and paste the code in manually.