You can buy Golden Firm in the mall, but it’s a bit expensive. It costs 8 yuan each. If it’s very low-level equipment, I advise you not to go for appraisal. You’ll lose money if you sell it in the future. Moreover, the early leveling is very fast, very fast. It's useless. Unless you have a lot of money, you don't care about these problems. Another channel can be to buy it in the Chengdu market. There are many people setting up stalls, so you can negotiate the price and calculate the ratio.

After you have the appraisal, go to the blacksmith on any map, put the things that need to be appraised on the left, and the gold appraisal on the right, click - Appraisal, complete.