Logging Into Salesforce
Once you have properly set up your account, you can log in to Salesforce at any time while you have your license. The link to the login screen is https://afcs.my.salesforce.com/.
Bookmarking the page while you are in the midst of your search is highly recommended.
Note: Going directly to Salesforce.com login will not let you log in. You will get an error. It is important to always use the above link.