I am not able to find a field for the year or range of years of arrival when I am using immigration records. Please tell me where I can do this or please add it as a search field. Thank you.
You would need to use the Any - Life Event (which has fields for years)
Or use year filters if available on the Results (usually you can filter by a year range).
If you would like specific help with a search - please include your search parameters.
Unfortunately, FS has (silently) taken away the collection-specific search fields.
For immigration records, I suggest Steve Morse's search pages, specifically the "Gold Form" for Ellis Island arrivals (https://stevemorse.org/ellis2/ellisgold.html).