There are two different ways to convert Leads in Zendesk Sell!
1. Navigate to your Lead Card and select the convert button.
2. You can also convert a lead from the Lead's View. Your Leads View will allow you to convert more than one Lead at a time.
Once you convert a Lead into a Contact, you will have the option of associating a Deal. To keep track of the Lead progression in the Funnel Report, it's best to immediately associate the Deal.
View how to convert a Lead to a Contact.