Update README.md

Describe the process to update and publish the member forms.
diff --git a/content/forms/README.md b/content/forms/README.md
index bcef892..ae555da 100644
--- a/content/forms/README.md
+++ b/content/forms/README.md
@@ -3,3 +3,8 @@
 These pages are the responsibility of the Secretary. Contact them at
 secretary@apache.org to discuss any changes or Pull Requests.
 
+In order to update the forms, check out a local copy of the .odt file, edit
+using OpenOffice and test locally.
+Update the .pdf file by exporting the file as PDF.
+After the changes have been reviewed, merge both .odt and .pdf files.
+Only the .pdf files will be published to the web.