To make a investment you must first become a member of assets-trader . Once you are signed up, you can make your first deposit. All deposits must be made through the Members Area. You can login using the member username and password you receive when signup.
You can open a free PM account here: www.bitcoin.com
It's quite easy and convenient. Follow this link, fill in the registration form and then press "Register".
Login to your account using your username and password and check the Withdraw section.