But did you select the satellites you want to watch in the humax box, there will be a big long list and you need to put a tick against each one and then save. So say you want 42east to 30west then you have to select all those sats. Do you undersatnd the idea for saving the sats? Dont worry about limits yet. That is only used if your dish is laible to hit an obstruction. It may have an option to select ALL but dont use that.
Once you have saved sats, then select one you know, say 28 east. Now when you press OK dish should move but if it does not look and see if there is a lict of channels already on box, say BBC1.
Try this one for manual. Its a tad confusing as it makes assumptions.
https://www.satexpat.com/doc/humax/HD-5600S_Manual.pdf