Https is an important part in magento as customer or user gain trust and it increase web site’s search engines rank also. To make your login page, register page, checkout page and admin panel as https you need to install SSL certificate into your server first.After Successful installation do the following process .
Go to System->Config->Web
then Click on Secure tab.
Change your base url to https://www.yoursite.com [ Important : Write HTTPS in your base url otherwise it will not work]
Make Use Secure URLs in Frontend to Yes
Make Use Secure URLs in Admin to Yes.
Then Save config Clear your cache, Now go to your frontend then click on login page you can see that your login page is changed to https.DOWNLOAD SOLUTION HERE