diff --git a/en/advanced/custom-themes.md b/en/advanced/custom-themes.md
index 8848bf349..46180d9ac 100644
--- a/en/advanced/custom-themes.md
+++ b/en/advanced/custom-themes.md
@@ -8,9 +8,15 @@
 * **Color scheme**: _Follow system_, _Light_, or _Dark_.
 * **Custom theme**: a CSS file of your own. JabRef applies it _on top_ of the selected theme and color scheme, so it only needs to contain what you want to change.
 
+### How to apply a theme or custom theme
+
+1. Open **File > Preferences > General**.
+2. In the **Appearance** section, choose a **Theme** and a **Color scheme** (_Follow system_, _Light_, or _Dark_).
+3. Check **Custom theme** and select your CSS file.
+
 JabRef picks up changes to the custom CSS file while running, so you can edit the file and see the result immediately.
 
-You can find a collection of user contributed themes at [https://themes.jabref.org](https://themes.jabref.org/).
+You can find a collection of user-contributed themes at [https://themes.jabref.org](https://themes.jabref.org/).
 
 ## Writing a custom theme