For Registering into the salesforce developer Edition, the Url as follows,
https://developer.salesforce.com/signup
Give the required fields and signup for account. The “UserName” must be in Email format.
For Login into the salesforce developer Edition, the Url as follows,
After the completion of registration, Entered the registered userId and Password as below image:
After Entering UserID and Password, Click Login
The Page will be Opened like this,
This is your Home page….