Can I edit this website?

From NMR Wiki

All NMR/EPR/MRI specialists, advanced users of these techniques and related business people are welcome to edit nmrwiki.org.

For example if you are a chemist using advanced NMR methods or a graduate or advanced undergraduate student specializing in NMR/EPR/MRI - you are certainly welcome to edit this site.

And, as explained here, there's no need to ask permissions or be afraid to edit.