Solo subscriptions are limited to one user. Team and Agency level subscribers can add users at a cost of $300 per month (for monthly subscribers) or $1200/year (for annual subscribers).
Companies wishing to support a much larger amount of users than the 10 that come with our Agency level are encouraged to talk to us about an Enterprise package so that we can custom design a subscription to fit your needs.
Not sure what counts toward your User limit? Please see the question above for a full explanation.