JJ1992
Please avoid posting the same question in multiple threads within a short period of time.
At this point two users in different threads (GOSbert and de0u) have explained that installing GrapheneOS does not require picking a search engine. There is no relationship between picking a search engine for searching and installing GrapheneOS.
To install GrapheneOS using the web installer, go to the GrapheneOS web installer page and go through the directions in order. It is important to follow the steps in order, without skipping any steps. The directions indicate what sort of cable is necessary, which browsers are known to work, when specific configurations are required for particular browsers, etc. If trouble is encountered when carefully following those directions in order, posting a question about exactly what is going wrong is likely to result in people providing an answer that will result in a successful installation.