So, you've uploaded a bunch of contacts and realised you need to change the details for some of them? Too easy! Here's a step by step guide on how to do it;
First, click on the Contacts tab. Then, using the search bar on the left, type in the contact you wish to edit. You can search by mobile number or name if one was supplied when you uploaded the contact.
Of course, you can always manually search through any groups you have your contacts uploaded to if you so wish.
Once you've found the customer you're looking for, you can update their details (such as number, first name, email address, what groups they're assigned to, etc.) by clicking on their number. Alternately you can delete or unsubscribe the contact by hovering over their entry in the results box and clicking the trash can or "stop" symbol respectively.