You will need to go to classic version,directories and click teams and then click the team you want to see and click the affix and it will show info about the number of horses, maximum gp etc... under maximum gp for sales it will show your rating if you have no stars click the 'x' and it will tell you to get a rating what you have to do,I hope this helps!

Like Twilight said, on the classic version all you would need to do is hover over the rating spot when you're in the team Affix. Here's an Example

Are draft horses not eligible for rating? Because I've never had this option for my Percheron team

Unfortunately, draught horse teams cannot be rated. They’re not included in the list of eligible species in the Breeder’s Manual.

5.4.6 - Rating an affix

“Riding horses, ponies, unicorns, and unicorn ponies team affixes are reviewed for a rating on the first day of each month”