Well, Access does not have "cells" - that is an Excel term.

But, what you are trying to do is not the "best" way to do this in Access.
You are trying to enter a "new" not in an existing field.  That violates
Access normalization rules.  If you want to track notes and include a time
or date, you need a new table.  Access is a *relational database* which
means that data should be stored in separate tables that are *related* to
each other using keys in the various tables.

If these notes apply to a particular client, for example, your tables might
look like this...

TblClientData
ClientNumber
ClientName
ClientAddress1
ClientAddress2
ClientCity
ClientState
ClientZip
etc.

You'd have a seperate table for "notes" or "calls" or "contact" with the
client....

TblClientCalls
ClientNumber
CallDate
CallTime
CallDuration
CallDetails

In this scenario, a client would have one record in the TblClientData.  If
they had been called ten times, they'd have ten records in the
TblClientCalls.

In your forms and reports, you'd create a main section with the client
details.  You'd have a subform or subreport with the call details.

Now, all that being said, Access has many template databases available on
their website for free.  I think there is one called "contact management"
that I have used many times as a starting point for my databases.

I'd recommend you take a look at the samples and use those as your starting
structure.