I believe you don’t have the functionality to create messages yet due to the low age/activity of your account. There are various Discourse trust levels, described here.
I need to change the organization name after rebranding
Only Dockstore admins can change the name of an approved organization. If your organization is already approved by Dockstore, please let us know which organization you would like to rename and the exact name that you would like to change it to, and we can update it for you.
I’ve added a new user to the organization as admin but he still can’t edit organization information
Has he accepted the organization invitation? To accept an organization invitation, the user must:
Log into Dockstore
Click the dropdown next to their username at the top right and select “Account”
Click on the Requests tab
At the bottom, the user should see the section “Organization Invites”, with an invitation to your organization and they can accept it there.
After he has done that, he should be able to edit organization information.