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how do i use these orbs?
You mean orbs in general? You go for menu, then select Item=>Weapon/Armor=>individual items. When you click on individual piece of weapon, armor or other equipment, you will open its own submenu. There you will find slots for orbs, glyphs, marks and spheres. Usually it goes like:
Any item in category Weapon: 1 mark, 1 glyph, 2 orbs.
Any item in category Armor: 1 sphere, 2 orbs.
There are unique items though, like staff with only 3 glyph slots or imba-ring Dawnguard with 5 glyph slots, which you get for Vesunna quest in ActII (if you choose the girl and not the city).
Experiment, minmax. Choosing right buffs for your item is what truly makes your characters powerful.