To remove password protection from Excel, you need to open the spreadsheet and go to the File > Info section. Then, click on the Protect Workbook option and select the Encrypt with password option ...

Users must enter the correct password to open and view the file. Unlocking Excel Spreadsheets without a Password Watch this video on YouTube.

Remember that, with password protections removed, anyone with access to your Excel file can open, view, and edit it. If you've decided a password isn't necessary anymore, this likely isn't an issue.