Go to the DuckDuckGo website. Left click on Firefox’s drop down menu icon in the search bar, then click ‘Add DuckDuckGo.’
Okay, now that I figured that out... How do I delete crap I inadvertently added??? :-)
Thanks!
It’s easy to get rid of unwanted search entries, click the down arrow to see the whole list, then select “manage search engines”. Then select the offending item, then click remove.