How to embed click-able links in your Gmail Signature has been written by so many that I feel kind of stupid even mentioning it. But what the hell, some might still be in the dark and benefit from it.
Embedding Text Links
To embed HTML links in your mails, you have to set your mail Editor to use Rich Text Formatting. If your Editor do not have the toolbar like the one shown below but with only the words, Rich Formatting on the left corner, then you are using the plain text editor. All you have to do is to click on the words to change it to Rich Text. Only then will you be able to use HTML links in your signature.
With that, you can now go to Settings by clicking on the icon that looks like a gear on the top right corner. Scroll down to see the Signature Option. In the provided Editor window you can now add in your signature.
To insert links, all you have to do is to highlight the words you want to link, click on the “link” icon to bring up the link editor.
Insert the URL of the page you want to link, then click OK.
Now you will have a click-able link embedded and whenever you send or reply to any of your mails, you friends or associates will be able to follow that link to find your blog or your social sites.
Adding An Image Link
If you want to look cooler still, you can also use an image instead of text as your link. However, the image have to be hosted somewhere that Gmail can pull the image from. I heard Picasa is a good place to host your image but I guess others will also do the job. For me, I upload the image to my own hosting account.
Once you have the image ready, make sure you have the full path where the image is uploaded. Click on the Add Image icon.
When the Image Link editor is opened, fill in the image location URL. Click Ok and the image will be inserted.
To make the image click-able, simply highlight the image and just like your text link, fill in the site where you want the image to link.
Click Save Changes.
Now whenever you are composing a new mail or replying a mail, you will have the mage and text links embedded automatically.