To carry out a simple search, type the term that you want to find in the Search box next to the Advanced Search tab, and press enter.
For a more refined search of songs or tunes use the Advanced search function. To carry out a search on two or more terms at once, e.g. Collector+Roud Number, select each term as above and then click search.
Be sure to clear previous searches before starting a new one by clicking on the x next to each search term at the top.