If you have installed MacTeX (the TeX Live distribution for macOS), you may start typesetting right away.
If TeXShop was installed with MacTeX, you may find it in the ''/Applications/TeX'' folder; otherwise, it will likely be in your ''/Applications'' folder. Open a ConTeXt document with TeXShop, choose the ''ConTeXt (LuaTeX)'' engine from the drop-down menu in the toolbar of the source window, and typeset!
Most likely, though, you will want to use the most up to date ConTeXt release (see [[Installation]]). For that, you need to perform the following one-time set up:
* it simplifies the code required in TeXShop to deal with synchronisation;
* it allows Hans ConTeXt's developers to continue improving synchronisation independently, and TeXShop can automatically benefit from such improvements (as long as <code>mtxrun</code>'s interface does not change).
There is one drawback: if something breaks, who is to blame?