Hi Jintan,
Do you want to rename the file "ME 3263: Cantilever Beam Frequency Vibration-WB"?If yes, then you need to save it with a new name in the system by clicking on the file and using save as.
If you want to change the name of the analysis in the project schematic, then you can click on the Rename option, as I have highlighted in the image. If this is not what you are asking, then please clarify it in the details.
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