Higher Ranks In Forums?

I have questioned this before and it has remained unrevealed to me on how we get higher ranks in the forums. Do we stay Junior Members for ever or what. Please help. Thanks

U must buy> https://forum.fresh-hotel.org/payments.php

0-50 Posts means Junior Member
50-100 Posts means Member
100+ Posts means Senior Member

Any other higher ranks are through the Paid Subscriptions which is located under settings which is the link that zm1234 just posted above^^^^

Thanks