Ben is correct. You need to purchase a new license from NI. You need one license for each user who will connect to a single VI. For example, if you want to publish one VI, and five users want to access it simultaneously, you will need a 5-user license. If you want to publish 5 VIs to 5 users simultaneously, you will need a 25-user license. Contact NI and you can get a new license from them.
J.R. Allen