This page will show you how to perform a search from within Prowlarr. In general, your searches would be via app, but it's possible to do them directly in Prowlarr as well.
To initiate a search, click on Search on the left menu. There will be a mostly blank page with some options at the bottom of the screen.

These are generally formatted as
{VariableName:SearchValue}e.g. For a TV Search of The Simpsons Season 32 the search input would be{TvdbId:71663} {Season:32}
Note that not all Indexers support all query types
Then click the Search button. Your results may take a few seconds to appear. Once they do, you can add or remove columns using the Options button, and you can sort and filter your results by either clicking on the column headers or using the Filter button.
You can download the result by clicking on the download icon on the right of the result. This will send it to the proper download client you have configured.
You can bulk grab results at once by checking the select boxes on the left side and hitting the Grab Releases button.
Anything downloaded will have the category assignment you've set in Prowlarr. This may require a manual import in your app program from a non-standard directory!
An aggregate multi-indexer endpoint will not be added due to the significant drawbacks of said functionality
http://{prowlarrhost}:{prowlarrport}/{baseurl}/{indexerid}/api?t=search&q={term}&apikey={yourkey}&cat={comma separated list}
http://192.168.1.100:9696/11/api?t=search&q=mike&apikey={yourkey}&cat=5000,2000Be sure to pass
X-Api-Keywith the API Key as a header
http://{prowlarrhost}:{prowlarrport}/{baseurl}/{indexerid}/api?t=search&q={term}&apikey={yourkey}&cat={comma separated list}
http://192.168.1.100:9696/{indexerid}/api?t=search&q=mike&cat=5000,2000http://{prowlarrhost}:{prowlarrport}/{baseurl}/api/v1/search?query={encoded term}&indexerIds={comma separated list}&categories={cat}&categories={other-cat}&type={searchtype}
http://192.168.1.100/prowlarr/api/v1/search?query=black%20hawk%20down&indexerIds=-1&categories=2000&type=searchhttp://192.168.1.100/prowlarr/api/v1/search?query=%7BTvdbId%3A71663%7D%20%7BSeason%3A32%7D&categories=5000&type=tvsearchParameters
query - URL Encoded Search StringindexerIds - comma separated list of Indexer ID
-2 is all torrents-1 is all usenetcategories - add a new parameter-value pair for each category to search
type - the search type to perform
search - Basic Text Querytvsearch - TV Query - Supports TV parametersmoviesearch - Movie Query - Supports Movie parametersaudiosearch - Audio/Music Query - Supports Music parametersbooksearch - Book Query - Supports Book parameters