You may Direct Select the path (white arrow).
Iin this case, you may ClickDrag the segment(s) you want to move.
Smart Guides are your friends.
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Assuming it's a so-called AreaType object, or a so-called Type On A Path object, AltClick the edge of the textFrame or containing path with the white pointer. Then numerically enter the dimension.
If it's a so-called PointType object, turn on the proportional chainlink to constrain the proportion. Then numerically enter the dimension. (A PointType object has no containing rectangle, so changing its width without also changing its height distorts the type.)
For my part you are welcome, Julie.