Its simple.
On the Gold -> Gems box, type in the number of Gems you want and it shows you the gold cost, and you click buy or not.
On the Gems -> Gold box, you type in the number of gems you want to convert, and it shows you the gold you will get in return.
If your aim is to make it easy for new players, make it actually easy! Instead of causing your player base of people that actually spends money in the gem store not need to jump through hoops to get the items they want, and the ones that don’t have the money to buy gems but want to spend gold also get what they want.
Until changes like this are made I will be voting with my wallet… (and its a shame too, I actually want some of the skins and stuff)