How do I change my build thread pic?

[SamMule]

Can't figure it out. Can someone please help?

 

[KrisReef]

I think you need to be a site supporting member to have editing privileges activated.
I can edit old posts, change pics days later, in my posts.
Is this the page you want to update?


Here's my 2.5 year old 13g

EDIT:
Here's my 2.5 year old 13g

 

[SamMule]

No, my build thread.
https://www.reef2reef.com/threads/red-sea-max250-restoration-build.734929/page-2#post-10684212