Paypal offers you with different membership accounts and you can signup with any of these for free of cost but based on the account type you will be able to access the features. There are a total of three account types ie Personal, Premier & Business. Here are the details of each account and what benefits you get with each of these accounts.

Personal Accounts :
You can Send money to Anyone
You get 24-hour fraud surveillance
You get Customer Service availability
Limited Access to eBay Tools
Limited Access to Merchant Services
Limited Access to Accept credit or debit cards

Premier Accounts :
You can Send money to Anyone
You get 24-hour fraud surveillance
You get Customer Service availability
You get Access to eBay Tools
You get Access to Merchant Services
You get Access to Accept credit or debit cards

Business Accounts :
You can Send money to Anyone
You get 24-hour fraud surveillance
You get Customer Service availability
You get Access to eBay Tools
You get Access to Merchant Services
You get Access to Accept credit or debit cards
Extra Feature : Multi-user access which means that you can add multiple emails to your account under profiles with send/recieve feature for all of them.

In case if you are holding the basic account and are looking to upgrade your account to the Premier or Business account then you have to visit this link and notify paypal team to upgrade your account and allow you to access all the above listed features.