how can i add a photo here?

meihuak

GreXXL

meihuak you could also use custom html widget (requiring Afrux Widget Core).

luceos

Although I never tested the extension, you might be able to use https://extiverse.com/extension/davwheat/flarum-ext-ads and then use the sidebar ad location.

meihuak

luceos if i want add the css code in the page directly, which file can i change?

luceos

meihuak you can add any custom css from the Admin, Appearance, Custom Styles.