I cant update a new member on our club website

How do I switch it to not be in Browser Mode: IE8 Compat View?

Also, here is what it detected during debugging...

Turning off Compatibility View: (found this via Google for IE8; I use IE11)

0. Turn off Developer Tools.
1. Goto tools menu (on the top) on Internet Explorer 8. (normal menu, not in Developer Tools)
2. Click on Compatibility view settings.
3. uncheck "Include updated websites list from Microsoft".
4. Uncheck "Display all websites in compatibility view" if it is checked.
5. Click on close, and you are done. refresh the page and you are good to go.

Make sure you clear your browser cache, also. (see support.toastmastersclubs.org/component/...earing-browser-cache ) Try out the steps that gave you the problem to see if it still exists.
If no go, then go back into Dev Tools and continue...

The "Object doesn't support this property or method" issue would be consistent with being in compatibility mode, since that mode shuts off some IE browser functionality.

I am a little more concerned about the Invalid Argument error, though. That error should also show up in the list in the Console pane with a link to the right of the error message. Could you click that link so that the relevant javascript shows up at the left and post a screen shot of that?