You can register by simply place a new ad - See How to place an ad? - and complete the process after you finish posting your ad.

Or you can follow these steps if you don't currently have an ad to post.

• Click on My account.
• Click on Register.
• Supply the info required such as your email and choose a password
• Check the box for "I hereby agree for processing my personal details by Terms of use"
• Check your email for a confirmation email and click on the link inside it.
• You are now a registered user on OLX!