First let me tell you where you can find and comment on.
When you are on home page of website you see only a list of resent posts. You will have to be on a post to see comment box. To go on a post, just click on the blue link on the top of the posts. This is the post heading. When you click on the link, you shall be taken to the post page, where you will be able to see the whole post.
Need to Connect
You have 4 Options to connect from (Type Something in Comment Box and you will see the bellow options to connect)
When you are on home page of website you see only a list of resent posts. You will have to be on a post to see comment box. To go on a post, just click on the blue link on the top of the posts. This is the post heading. When you click on the link, you shall be taken to the post page, where you will be able to see the whole post.
Need to Connect
You have 4 Options to connect from (Type Something in Comment Box and you will see the bellow options to connect)

