Denton County Jail

How and where can I find a link to set up an account for e-messaging.I had found a website stating that you can send an email to the denton co. jail and they print out the paper to give to the inmate. Supposally it faster to do it this way since it takes about 2 days for the inmate to receive then the regular mail which can take up to few weeks. and of course the jail wants to charge you 44 cents every time you send this e - messaging for the "stamp". I need help I cant find it now.