Here's a walk-thru of the process from an Office Hours session. 

Sometimes, instead of blocking off member pages completely, you may want to allow non-members to see that content exists, and use their page access as an opportunity to offer them membership access.  You can display teaser content, giving them a small view of what they would get with membership, and/or refer them to your sales page, offering them instant access if they upgrade. 

To do this you would need to use the MM_Access_Decision SmartTag.

Below is an example of how you would show teaser content and full content on the same page based on whether someone is a member or not. In the first snippet we are only showing content to non-members while the second snippet is only visible to members.

Only non-members will see the content inside these tags:

[MM_Access_Decision access='false']

Here is your teaser content.

Click here to purchase access: <a href="[MM_Purchase_Link productId='1']">Get Access</a>

[/MM_Access_Decision]

Only members will see the content inside these tags:

[MM_Access_Decision access='true']

Here is your complete content. 

[/MM_Access_Decision]

IMPORTANT NOTE: As soon as you use [MM_Access_Decision access='false'] or [MM_Access_Decision access='future'] on a page/post, you're instructing MemberMouse to bypass the standard hard-block (full page) protection mechanism. This means that as soon as you use one of these tags, any content outside of a [MM_Access_Decision access=''] tag, will be visible to anyone who can access the page. So, when using these SmartTags, only the content within the SmartTags is protected. Read this article to learn more about setting full page protections.