Upload your club's entry file from your team management software, usually Hy-Tek Team Manager.
More detail
Accepted files are .hy3, .sd3 or .cl3 files, a .zip of them, or a spreadsheet (.xlsx, .xls, .csv or .txt), up to 10 MB.
In Team Manager, import this meet's events file, add your swimmers' entries, then export the entries for Meet Manager. That creates a .zip you can upload here as it is.