GRASS "New Mapset" and "Open Mapset" etc is greyed out

Question

All tutorials I have looked at say to just click "New Mapset" to begin a new one but obviously I can't do this to even begin.

I'm not sure if there's something you need to do before creating a new Mapset: I've tried it with a (OS OpenData) map already in QGIS and with a blank page and nothing seems to allow me to click on it.

What am I doing wrong?

Answer 1

Try changing your Custom paths in Grass Options>General to:

/Applications/QGIS.app/Contents/MacOS/grass7

Steps:
1. Click Plugins;
2. Click GRASS;
3. Click GRASS Options->General ->Custom;
4. Fill in: /Applications/QGIS.app/Contents/MacOS/grass7

Refers to this post: Set QGIS 2.18.7 on OSX - 10.12 to use GRASS 7

Answer 2

Update for 2020 / QGIS 3.10.7 LTR

Like Chunli and AndreJ said, you need to update your Custom Path in Pugins > Grass > Grass Options. Here's what mine is set to:

/Applications/QGIS3.10.app/Contents/Resources/grass7

For future Mac users with this issue, you can check the location of grass7 using the command line. Here's what I did:

cd /Applications/QGIS3.10.app/.
find . -name "grass"

And here was my result:

./Contents/Resources/grass
./Contents/Resources/resources/cpt-city-qgis-min/grass
./Contents/Resources/grass7/etc/python/grass
./Contents/Resources/grass7/etc/colors/grass
./Contents/Resources/grass7/gui/icons/grass

That's how I knew to use /Applications/QGIS3.10.app/Contents/Resources/grass7 as the path, and it enabled my GRASS options in QGIS.