You are able to create multiple E-mail signatures within Snapforce.
To create a signature, click your Username -> Settings.
Under Personal, click E-mail Signatures.
Click the Add Signature tab.
Enter a title for this signature.
You can type and format a new signature, or you can paste an existing signature into the textbox, with images included.
If this will be your default signature, click the 'Make Default' checkbox below.
Once you approve of the signature's appearance, click Save.
To see this signature, click the Signatures tab. This will bring you back to the list of existing signatures. Here you will have the ability to delete the signature or go back to the Edit page to make changes.