You can do this at the Metalsmith.
Step 1. Drag and drop your armor/weapon in slot number 1.
Step 2. You will see the slots for EITHER dim star debris or those stars. Can use either one to refine. Dim Star Debris has a lower success percentage, you need more of them to reach 100%. You can also combine the two types of refining items. Mix until you’re satisfied.
Also, note that after +5, the dim shards are not as effective as the stars. So you’re forced to use those instead.
Second note: only the base stats will be improved. Not the bonuses/ blue stats:
You also gain 1 gem socket for every +3 on your item.
Step 3. You see the success percentage. Keep on adding dim/stars (use the + button) until it reaches 100% or close to that.
Step 4. Make sure you have the necessary money.
Bound gear/weapon needs soul-coins for refine.
Unbound needs tradable coins.
Step 5. Press START.
Tiny little addition:
Here’s a screenie of FH town.
I marked with 1 the box where you can type in an NPC’s name, in case you forgot where it is, or quest has no auto-route. Or to find the above-named Metalsmith.
For 2, I circled the teleporters. Blue ones are free, they teleport you within a map. Green ones cost soul-coins and teleport you from one map to the other.
Author: Lilly