This are the guidelines on how to put your signature below you post.First make a signature by using Paint,Gimp,Microsoft Photo Editor and so much more.If you don't know how to make the background transparent.Go to microsoft photo editor.After that click tools and set transparent color.The microsoft photo editor can be found in the programs of your computer. Save your signature to photobucket or other photo hosting sites. Next I'm going to show you the steps of the above question.
1.Go to layout then edit html.
2.Check the expand widget template.
3.Click Ctrl f and paste the code below.
<div class='post-footer-line post-footer-line-1'>
4. Under it paste code and change the IMAGE URL of the url address of your signature.
<img src='IMAGE URL' style='border: none; background: transparent;'/>
5.Preview it first before saving to avoid error.
6.You can see the result in the preview.Good luck.