Before you can post in a group, you should be a member of the group. Depending on the group settings, you will be allowed to post. 

In the group actions menu, choose for add Post.  

Fill in the following fields: 

• Type 
• Title * 
• Content 
  • Text * 
  • Document 
  • Image 
  • Video 
  • Webtools Unified Embed Code 
• Tags 

* mandatory fields