It's the other way around. You associate a field scheme with a project. (Minor quibble with the question, and probably more about language than the technical points)
Log in as an admin, go to the project, look at the config and find the current field scheme. Click on the configure link and select the scheme you want to change it to in the list it offers.
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs
We're bringing product updates and pro tips on teamwork to ten cities around the world.Save your spot