1- If the blog belongs to a particular group, go to Groups > the group you want to access > Contents > Blog (or the name of the blog); if the blog you want to access is general to the portal, you only need to select it using the Tools option in the menu on the left hand side of the portal's main page. If it is your personal blog, go to Personal zone > Own contents > Blog.

2- Click on the title of the item that you want to add a comment to, or on the link View complete post.

3- Write the text you want to publish in the Add a comment text box at the bottom of the screen.

4- Click on Save.