Installing from the Atlassian Marketplace

To install, follow these steps:

1. Go to the Atlassian Marketplace page for Custom Fields Administrator For Jira Project and select Server from the drop-down at the right.

2. Buy or evaluate the add-on with a free 30-day trial.

3. Enter the details on the New evaluation screen and generate a license.
4. Download the jar file. Now, log in to Jira as an administrator.
5. Go to the Administration icon  and click on it.
6. Locate Add-ons from the menu and click on it.
7. Click on Manage add-ons.
8. Click on and upload the jar file.

You have installed the Administer Fields for Project add-on.

Uninstallation

To uninstall, follow these steps:

1. Log in to Jira as an administrator.

2. Click on the Administration icon . Navigate to Add-ons > Manage Add-ons.

3. Under User-Installed Add-ons, search for Administer Fields for Project and click on it. 
4. Click on Uninstall.

The add-on is uninstalled from your Jira instance.