How to rename MySQL database user in Plesk?
You can change the existing Mysql database username following the steps given below.
Step 1: Login to Plesk control panel.
Step 2: Under Websites & Domains,click Databases.
Step 3: Under Users tab, click on the required username to be changed.
Step 4: Provide the new name in the Database user name field and click OK.
Respective username will be changed as shown in the below image.