Getting volunteers to act as presenters in a community radio station is not hard. There are a few steps you need to follow, if that is what you want to achieve.
You need to start by getting word out that you are looking for volunteers to act as presenters in the said community radio stations.
Then you need to set up a mechanism for receiving applications from people who are keen on volunteering as presenters in the said radio station. This may, for instance, involve you taking time to go through the Gmail account sign up process, as described in this site, so as to get an email account for receiving applications. Actually, this is something you need to do before announcing the vacancies, because logic dictates that you specify where applications are to be sent when ‘getting the word out’ that you need volunteer presenters.
After that, you need to receive and review the applications from the people interested in serving as volunteer presenters in the radio station.
The final phase will involve interviewing the people in question (after having shortlisted those who show some promise). The successful candidates then need to be trained, before being commissioned. Meanwhile, you should be working hard towards getting some revenue streams for the radio station, so that it doesn’t have to rely on volunteer presenters (who may not always be the best of the best).