First you must be signed in to FamilySearch in order to be able to export to Excel. As you probably know, it's free to sign in and you don't have to be an LDS member to do so. I've used this feature to export a table of all persons in the FamilySearch database with my surname who were born in a certain date range (to do this I went to "Search" --> "Records", then specified my search criteria. I don't know for sure but I believe you could do other types of searches and exports, for example "Search" --> "Genealogies" as well. If you have your own family tree in FamilySearch, which I don't happen to have in my case, I don't know whether or not you could export it to Excel.) When you complete your search, at the top of the table of search results you can select whether to display 20, 50 or 75 records per page. There is also a button at the upper right of the table of results labeled "Export Results 1-NN", where NN = 20, 50, or 75 as you've selected. If you're not signed in, you can still do the search and get the same search results, but the Excel export function isn't there.