Putting expiration time in IQ options

chrisoz

I've been using Olymp trade all my life cause of the simplicity, but I recently had some difficulties and I'm learning how to use It options.

My question is how does one out in an expiration time on the mobile app apart from the 1, 5 and 15 minutes preset in the time?

And also I don't understand how it doesn't count the way it's supposed to. Like if you out 15 minutes and you're about to cinfurm your trade, you might see... 12 minutes. I know it has something to do with the time of the current candles (which I cannot see) but I don't understand it ?