summarize tutorial and update README

README.md

@@ -131,32 +131,16 @@ install-type archetype and prints the Ra build recipe.
 ## Permissions
 
 Members of the `unx-mx_adm` group can update `/opt/psi/MX` directly — no -adm
-account needed. Permission problems: tell the admins.
+account needed. Permission problems: (1) if you are not in unx-mx_adm group, 
+ask Meitian/May/Dawn for being added to the group. (2) if you are in the group 
+for more than 48 hours and still can't write to /opt/psi/MX, ask the SLS 
+beamline storage and compute admins (Email: sls-htc-admins@lists.psi.ch).
 
 ## Tutorial branches (build-*)
 
-Each participant works on their own `build-<module>` branch (e.g.
-`build-dials`), all starting from `main`.
-
-While a branch is still identical to main (fast-forward):
-
-```bash
-git push origin main:build-dials main:build-buster ...
-for b in dials buster ...; do git branch -f build-$b main; done
-```
-
-Once branches have diverged, merge main into each instead:
-
-```bash
-for b in dials buster ...; do
-  git checkout build-$b && git merge main && git push
-done
-git checkout main
-```
-
-If `git push origin main:build-xxx` fails with "non-fast-forward", the branch
-has its own commits: use the merge loop, never force-push over other people's
-work.
+Tutorial branches are all merged to `main`. Thank May (Phenix), Dennis (ccp4),
+Emma (CrystFEL), Filipa (Pymol), Milton (Xtrapol8) for building and prepare
+the scripts together. 
 
 ## Resources
 
@@ -164,6 +148,8 @@ work.
 - modbuild documentation: https://pmodules.github.io/modbuild/
 - Environment Modules: https://envmodules.io/
 
+If you want to provide more, feel free to submit a pull request to this document.
+
 ## Acknowledgements
 
 Many thanks to [Achim Gsell](https://www.psi.ch/en/lsm/people/achim-gsell)