add umbrel guide

page/umbrel.md

@@ -2,3 +2,20 @@ How to disable datacarrier on Umbrel.
 ===
 
 1. Login to your umbrel
+2. Click on Bitcoin Knots then the three dots and on `advanced settings`.
+
+<img src="../pictures/1-umbrel.png" width="50%" height="50%" />
+
+3. Click on the optimisation section.
+
+<img src="../pictures/2-umbrel.png" width="50%" height="50%" />
+
+4. Uncheck the `Relay transaction with embedded data` option.
+
+<img src="../pictures/3-umbrel.png" width="50%" height="50%" />
+
+5. Click on `save and restart bitcoin node`.
+
+<img src="../pictures/4-umbrel.png" width="50%" height="50%" />
+
+Bitcoin Knots will automatically restart and the change will be done!