Most Blogger template by default put a "About Me" or Profile at the top of the sidebar. The information you get in the "About Me" section will be the information you gave when you first created a Blogger account. As you can see from the screenshot in the left, only the "Display name" is shown. No photo, no description.
There are many ways in which you can edit your profile or "About Me". You can sign into blogger.com (Dashboard) click EDIT PROFILE at the top right of the Dashboard and you will get to your Profile editor. There you can edit the "About Me" (Profile) with many options - add a photo, description, town, region, country you live in, your homepage URL (this will become a link that direct visitors to your favorite webpage which may be your own or others), add your interests, favorite movies, favorite musics, favorite books, email address, chose whether to display the email address for visitor to your full profile to email your, etc. All these are options which you can choose to add or ignore. You can also give your birth date, but this will mean the astrological sign (Cancer, Capricorn, Virgo, etc) will be displayed. Many don't like this and if you don't want it, leave your date of birth blank. You may be interested to know that you can use some limited HTML tags in the description such as the hyperlink HTML tag <a> (refer to Hyperlinks in "About Me" or Profile and How to make active (clickable) hyperlinks.
TO BE CONTINUED