Your changes are saved into the data/ folder of the eSisya19/ideal-kitchen repository. To allow that, create a fine-grained personal access token:

1. Go to GitHub → Settings → Developer settings → Fine-grained tokens → Generate new token.
2. Under Repository access, select only ideal-kitchen.
3. Under Permissions → Repository permissions, set Contents to Read and write.
4. Generate the token, copy it, paste it above and click Save token.

The token is stored only in this browser (never uploaded to the site). After publishing, the live website updates within about a minute.

Change the admin password: open admin.html and edit the ADMIN_PASSWORD value near the top of the script, then re-publish the file. (This password is basic protection only — keep the admin URL private.)