Adding an agency to Twitter is a straightforward process that can be completed in just a few simple steps. First, you'll need to create a Twitter account for your agency if you haven't already done so. Once you've logged in to your account, navigate to the "Settings and Privacy" section and click on the "Account" tab. From here, you can select "Add an Existing Account" and enter the username and password for the agency's Twitter account. Once you've added the account, you can switch between your personal and agency accounts by clicking on your profile icon and selecting the appropriate account from the drop-down menu. It's important to note that you'll need to have access to the agency's Twitter account in order to add it to your own account. If you don't have the necessary login information, you may need to contact the agency directly to request access.