The Sidebar Selector helps Grow's script find the right place in your sidebar and uses it to place the Sidebar Recommended Content.
Without the correct selector, the Grow script may not be able to place the Sidebar Widget; it's a small but mighty piece of information!
Grow Has Built-In Selectors
These selectors that represent what a majority of themes use; Wordpress themes in particular are pretty consistent.
If the Sidebar Widget is appearing after you've enabled this feature (and the Grow script is live on your site), you can leave the Sidebar Selector box empty. If Grow Recommended Content is NOT appearing in the sidebar on your site, you can try the below common selectors.
Here are some common Sidebar Selectors:
.sidebar.sidebar-primary#secondary
But - You May Need Manual Selectors!
If you're still having a bit of trouble finding your content selector, we recommend reaching out to your developer for further assistance. Certain custom themes can be a bit tricky in this area, so recruiting backup can be very helpful!