If you see a Turn Off Instant Messaging link, then you already have the instant messenger enabled.If you see a Turn On Instant Messaging link, you will want to click that link.
Again, to the far right of the friend request, you will find a Block link.
To unblock a user, click the Mail tab followed by the Blocked Users link.
If a user is online, you'll see an 'ONLINE NOW' image just to the right of his or her user name.
There are a number of reasons why the person may not have replied to your instant message.
From there, click the Who's Online link to see hundreds of online Mingle2 users.
The easiest way to see other online people is to go to the Search tab.In either case, you might want to try again at another time…or find another member to chat with.If another member sends you an invitation, you will see a box come down from the top of the Mingle2 page.If you have received a nudge, you will be able to check the profile of the person who sent it, nudge the person back, block the person, or simply remove the nudge. To do this, click the Mail tab, followed by the Filters link.On the next page (shown below), there will be a variety of filter options for you to choose from.Clicking this link will block the member who sent the nudge.