To bring references into Rayyan, you will first need to export your search results.
When exporting from a database, send every reference from your search results. Do not make inclusion or exclusion decisions at this point! (You will make include and exclude results in Rayyan later, which will record the decisions and make reporting the tally of included and excluded references easier.)
Export from EBSCO databases
Export from ProQuest databases
Export from PubMed
Export from Web of Science databases