A family of Microsoft word processing software products for creating web, email, and print documents.
Manually?
Put the cursor in the content control and use the right arrow key to move out of it. That will be indicated by the title where present disappearing. Add the text.
By macro?
Dim oCC As ContentControl
Dim oRng As Range
Set oCC = Selection.Cells(1).Range.ContentControls(1)
Set oRng = oCC.Range
oRng.End = oRng.End + 1
oRng.Collapse 0
oRng.Select