If you're asked on a bug issue to provide us a DXDiag (Windows) or System Information (macOS) report, this is how to generate that file we require.
First, we'll cover Windows users, but scroll down to find macOS instructions also.
After you have followed the instructions below and created your log file, return to your web browser and ensure you're on the correct bug page, scroll down and click in the Comment box, then drag the text file from wherever it was saved and onto the comment. This will attach the file ready to send back to us. Type in a quick comment (e.g. "Here is the requested log" or similar) and then send the comment as usual.
DXDiag (Windows)
On Windows 8->11, right-click your Start button and choose Run. Alternatively (or if Windows 7), press and hold your Windows key on your keyboard, then press R.
That will give you the Run dialogue. Type in "dxdiag" as shown below, then click the OK button.
When the DirectX Diagnostic Tool opens, it will start a progress bar to the left of the window. Allow this to finish, then click Save All Information.
It will ask you to create a new text file to save the logged information. Leave the name as DxDiag, but take note of where the file is to be saved, then click the Save button.
Investigate The DXDiag Report Yourself Also!
If your issue is that GameMaker or games crash (or don't ever start), open the DXDiag report yourself and scroll to the very bottom. Often, the last 10 or so application crashes will be listed in this file (this is part of the information we're looking for you to send us). Reading the error message written here will often give vital information as to what caused the crash - try Googling the error message if the information doesn't immediately suggest a fix to you.
Whether you manage to fix the issue by reading the crash report or not, always still send us the DXDiag report and any updated information in your comment on the bug.
System Information (macOS)
Click the Apple menu on your menubar, then "About this Mac". This will open the Overview for your Mac (an old example of this dialog is shown below).
Click the System Report button as shown, and this will open a new app which gives you detailed information about your system.
You will see that your menubar has now changed to be System Information, and if you now open the File menu, then you will have an open to save a report.
It will ask you where to save the logged information. Leave the name as the default (which should be the model of Mac you're using), but take note of where the file is to be saved, then click the Save button.
More information can be found at https://support.apple.com/en-gb/HT203001