I think I can merge two Ancester ID's but the record hint does not allow the comparison. What do I need to do to be able to review the ID's.
I think maybe you're trying to conflate two different parts of FamilySearch?
Merging applies to pairs of Family Tree profiles.
Record Hints apply to a single Family Tree profile and an indexed historical record.
Both processes involve comparison of data to see if the two things are talking about the same person or not, but there all similarity ends; merging two profiles is a very different process from attaching a historical record to a profile.
Which one are you trying to do?
@Sandra Rae Barrett
To add to @Julia Szent-Györgyi 's comment, the Research Help section at the top right will list possible duplicates with an ID number. Clicking on this should allow you to compare the individuals and merge them. The same section also lists possible matches found in historical records. Clicking on these allows you to link the historical record to the individual and, depending on the nature of the record, other family members. As Julia says, this is a quite different process.
Here's my guess of what you are trying to do. If I'm wrong, please ask again and provide much more detail as to what you want to do.
I assume you have found two people in Family Tree whose individual records you have thoroughly reviewed and have concluded they are the same people. However, under Research Help which includes Record Hints, Possible Duplicates, Data Errors, and research suggestions, they do not appear as Possible Duplicates.
In this situation, you go to the page of one of these people and copy the ID number. Then you go the to page for the other person and in the right hand column, scroll down until you come to Merge by ID. Click there, paste in the ID number you copied then click to proceed to the first screen of the merge system.