diff --git a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/40.electromagnetism/05.first-steps/textbook.en.md b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/40.electromagnetism/05.first-steps/textbook.en.md
index 3d6132535..e50dc4598 100644
--- a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/40.electromagnetism/05.first-steps/textbook.en.md
+++ b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/40.electromagnetism/05.first-steps/textbook.en.md
@@ -50,14 +50,28 @@ starting with three initials in brackets that represent you :
 (CLM): previous comment.<br>
 *(my initials): my comment* 
 
-To **communicate my proposals**, either:<br>
-* Directly on the *GitLab M3P2*:<br>
-<details>
-<summary> More information </summary>
-Only for those who have an M3P2 account and have received the little introduction to Git:<br>
-   - Click "Améliorer ce cours" at the bottom of the page.<br>
-   - Login with your username / password
-</details>
+#### Where to contribute?
+
+To **communicate my proposals**, either :
+* directly on the GitLab m3p2 with your login/password, and after a little training on Git. 
+
+   * *Click on "Edit this course"* at the bottom of each column of this page (levels 1 and 2),   
+or of the page "https://m3p2.com/en/lessons/brainstorming-234-electromagnetism"(levels 2, 3 and 4).
+
+   * If you prefer *to see in full screen each column* on this page, go to :   
+For these *general instructions* : https://m3p2.com/en/brainstorming-pedagogical-teams/synthesis-structuring/electromagnetism/first-steps  
+For *level 1* : https://m3p2.com/en/brainstorming-pedagogical-teams/synthesis-structuring/electromagnetism/n1/brainstorming
+For *level 2* : https://m3p2.com/en/brainstorming-pedagogical-teams/synthesis-structuring/electromagnetism/n2/brainstorming  
+For *level 3* : https://m3p2.com/en/brainstorming-pedagogical-teams/synthesis-structuring/electromagnetism/n3/brainstorming 
+For *level 4* : https://m3p2.com/en/brainstorming-pedagogical-teams/synthesis-structuring/electromagnetism/n4/brainstorming  
+then *to contribute*, click on "*Edit this course*" at the bottom of the page. 
+
+* *In the M3P2 Googledoc* whose link has been given to you.   
+The contribution is to be made in the "Herramientas matemáticas" folder, in the words documents :
+   * for *level 1* : Niv/Lev_ElectroMag_1.docx
+   * for *level 2* : Niv/Lev_ElectroMag_2.docx
+   * for *level 3* : Niv/Lev_ElectroMag_3.docx
+   * for *level 4* : Niv/Lev_ElectroMag_4.docx
 
 * On the *Google Docs M3P2*: to be specified.