You can first do this when you create a new client record. If you don't see 'Clients' listed on the left-hand column, change your context (upper left corner) to Facilitator. Only facilitators can create and edit client records. This gives them a place to keep private notes on a client. Conversely, center administrators and facilitators can see Sessions.
If you want to add emergency contact info after you've created a client record, you can do that in the 'Client' record at any time. Simply, go into the client record you want to add this info to and click the pencil icon in the upper right corner of the client's record. A pop-up will appear for you to add it in.