The Explore template has built-in pop-up login form module position which you may want to use to allow your customers quick login to your online store and easy manage customers account. To could use Pop-up Login Form position simply publish your login form into loginform module position.

After you customer will login he will get an access to his account also using Pop-up Login Form. 
You will find the Pop-up Login Form module at the top of the demo webstore.