If you, like me, get on howrse for your daily business, then get off, then come back on for breeding time. Then this should be useful.
1.When doing your daily howrse routine, try to fit in time to prepare your unis for breeding time. I usually leave them two months until they are ready, so you can just age them if you're ready, or leave them to sleep during the update.
2.Get on at about 6:15 GMT.
3.Go onto your uni's page, and click on breed a mare (age her if she's not quite ready).
4.Search for a stallion of the same breed, with 100% purity, and 100 BLUP.
5.When the list loads, look in a few pages for a uni stally.
6.Click Select.
7.Refresh the page every half a minute.
8.When the time is 6:23 GMT, click Cover.
NB: If you have many uni mares, get on at about 6:10 GMT (or earlier if you have loads), and get all of them at stage 6.
Remember, if someone else accepts the covering before you, you'll be taken to your horses' page.