Step 1: To add an agency via Google Search, click the three dots icon on the upper right corner of your Google Business Profile's dashboard.
Step 2: Click Business Profile Settings
Step 3: Click Managers
Step 4: Click Add
Step 5: There will be a text field where you can type your agency's email address.
Step 6: Since you're going to add us, type agentbolt06@gmail.com
Step 7: Once you're done adding agentbolt06@gmail.com, press the Invite button.
Step 8: After pressing the Invite button, you should see at the bottom that the invite is pending. Now, all you have to do is wait for your agency to accept the invite and they'll finally be able to manage your GMB profile on your behalf.