To use the Icon Set file from Git Aset in Affinity Designer, follow these steps:
a. Make sure you have a file format supported by Affinity Designer, such as AI, EPS, SVG, PNG, or JPG.
b. Open Affinity Designer and create a new document or open an existing one.
c. Select "File" > "Place" from the menu, then find and select the desired file.
d. Click "Open" to place the file into the Affinity Designer document.