Edit deprecated thread

Hellow, and sorry if i did something wrong, posting this here, in this section.
I have a thread in deprecated forum area. I can bumb it but i cant edit it. Is it a bug?
https://forums.digitalpoint.com/threads/unbanable-music-site-100-working-script.2618844/
I need to edit it, what i am doing wrong?
Thanks.

See original post by Sev7en