Hi @barbb, all discussions in Groups have a REPLY button. See the Group Directory here (https://connect.mayoclinic.org/groups/)
You can reply to a specific message within a discussion or post a reply at the very end of the discussion thread. This blog article explains more:
– Replies and @mentions: How do I know who is replying to whom? https://connect.mayoclinic.org/page/about-connect/newsfeed-post/replies-and-mentions-how-do-i-know-who-is-replying-to-whom/

There are also blogs or Pages on Mayo Clinic Connect. These are blogs written by Mayo Clinic experts on a variety of topics. See the Page Directory here (https://connect.mayoclinic.org/pages/).
On the blogs you COMMENT. They function the same as replies.

One of the Pages is called About Connect: Who, What & Why https://connect.mayoclinic.org/page/about-connect/
In this blog we feature spotlight about members and this past week @julieo4 was the featured member.
- Staying Connected with Assistive Technology for Hearing Loss: Meet @julieo4 https://connect.mayoclinic.org/page/about-connect/newsfeed-post/staying-connected-with-assistive-technology-for-hearing-loss-meet-juieo4/

Hence, you've seen both REPLY and COMMENT recently. If you do not see the option to reply or comment, then you will need to Login.

Hope the clarifies rather than adds confusion. 🙂
If you have more technical questions, you can always contact me using this form: https://connect.mayoclinic.org/contact-a-community-moderator/