I've read the User Agreement and accepted it in all its parts.

Ii is HIGHLY RECOMMENDED TO USE YOUR REAL NAME ("Name Surname") as a username, since this is a professional network. Please try yo use your own name.
Account information
Your preferred username; punctuation is not allowed except for periods, hyphens, and underscores.
A valid e-mail address. All e-mails from the system will be sent to this address. The e-mail address is not made public and will only be used if you wish to receive a new password or wish to receive certain news or notifications by e-mail.
Groups
Type the characters shown in the picture above; if you can't read them, submit the form and a new image will be generated.
Picture

Your virtual face or picture. Maximum dimensions are 85x85 and the maximum size is 300 kB.
Company information
name of your company
your position in the company
Personal information
Talk about yourself in the social media environment: what do you do, why are you interested in social media, or just anything else you want other people to know about you and social media