Here are the instructions for installing the Rename Email Subjects Chrome extension:

1. Install the cloudHQ Chrome browser extension Rename Email from this location: https://chrome.google.com/webstore/detail/rename-email/miepnlkmnjdfcnkplikgackpobfmaifb:
   
2. Click “Add extension”:
   
3. Go to Gmail and log into your account.

With this feature, you can rename the email subjects of your messages to find your emails easily:

Here is how you can rename email subject in Gmail:

1. Open a message or email thread:
   
2. You should see the pencil button , which is the rename icon.
3. Click the “rename icon” (it should be next to trash icon):
   
4. You should see that it is loading:
   
5. Type in new name of the email with a new subject:
   
6. Then click “Rename”:
   
7. Wait for a few seconds:
   
8. The email will be renamed: