Somehow my e-mail signature has been cut off. I use mail on my desktop and have a gmail account. I don’t know if this happened when I downloaded the new MAC software update or when I tried to log into my son’s new g-mail account. Can you help me set it up?

One thing I noticed this morning is that my e-mail were appearing on my I phone and IPad but not on my desktop. Somehow I was able to correct that on my desktop but I don’t remember what I did.

You created a screen shot of my info for my signature awhile ago. I tried putting that back into signatures, but it doesn’t show up when I draft a new e-mail.
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In order to get your outgoing email to utilize the signature you created in your mail application, you first have to drag it onto the email account in the left column as shown by the red arrow in the pic below. Next, you'll want to select the signature using the drop down menu at the second red arrow. After thetas done, each time you create an outgoing email it will include that signature.