You can edit resource tags by the following steps.

Editing the tag of a single instance

1. Log in to the TencentDB for MySQL Console and select Instance List on the left sidebar.
2. Select More > Edit Tag in the "Operation" column of the instance whose tag you want to edit.
   
3. In the pop-up dialog box, add, modify, or delete a tag, and click OK.
   

Editing the tags of multiple instances

1. Select the instances whose tags you want to edit from the instance list, and click More > Edit Tag at the top of the list.
   
2. In the pop-up dialog box, add, modify, or delete tags, and click OK.