The error is telling you to use the menu item:
Settings > Transition Settings
and then click on the "Full Scan" tab.
On the Full Scan tab, if you choose something in the "Isotope Peaks Included" dropdown then Skyline will extract chromatograms from MS1 spectra.
To tell Skyline to extract chromatograms from MS2 spectra you would usually choose "DIA" in the "Acquisition Method" dropdown in the "MS/MS filtering" section on that dropdown. After you choose "DIA" you would probably choose "Results Only" in the "Isolation Scheme" dropdown.
After you make those settings changes you will probably be able to use the menu item:
File > Import > Results
to tell Skyline to extract chromatograms from your .wiff or .wiff2 files.
If you go to the Skyline tutorials page there are several tutorials in the "Introduction to full-scan acquisition data" section which will help you get started:
https://skyline.ms/home/software/Skyline/wiki-page.view?name=tutorials
If you get stuck you can send us your files and we can figure out what you need to do.
In Skyline you can use the menu item:
File > Share
to create a .zip file containing your Skyline document and supporting files including extracted chromatograms.
If you want to send us your .wiff or .wiff2 files, you should also send us the .wiff.scan file which goes with it because we cannot read .wiff or .wiff2 files without the accompanying .wiff.scan.
Files which are less than 50MB can be attached to these support requests. You can always upload larger files here:
https://skyline.ms/files.url
-- Nick