First Create an acccount---> then click on drop down button (Manage External account) -->click on enable as partner ---> then create contact under that account ---> then click on drop down button (Manage External User) -->click on enable as partner user---> then it will be redirected to new page to create partner user ----> fill the required details(User license should be partner community)
First Create an acccount---> then click on drop down button (Manage External account) -->click on enable as partner ---> then create contact under that account ---> then click on drop down button (Manage External User) -->click on enable as partner user---> then it will be redirected to new page to create partner user ----> fill the required details(User license should be partner community)
https://help.salesforce.com/apex/HTViewHelpDoc?id=partner_portal_creating_partner_users.htm&language=en
If this helps you then let me know.
Regards,
Sailee