Note: Make sure you are using either Google Chrome or Firefox during the installation process.
Now Gmail lets you create and use multiple signatures in your email.
For example, you can add one signature with all the necessary contact information for new emails:
And the second signature, more simple, for reply/forward emails:
To start using this feature, simply open Gmail and head over to the Settings page by tapping the gear icon and then click on Settings.
Scroll down until you see the Signature settings. Click on Create New. Paste the signature into the signature box using either Right Click then Paste or CTRL + V shortcut.
Optional: Check the box to “Insert the signature before quoted text”
Choose the default signature for new emails and replies/forwards.
To change your signature while you write an email, at the bottom of the window, click Insert signature
Now you can repeat this procedure as many times as you need. Once all your signatures have been prepared, you will be able to select one of them each time you compose a new email message.