If you want to perform a spell check in Excel:
Click on the Spelling option, which is located in the 'Proofing' group, on the Review table of the Excel ribbon.
These steps are described in further detail below:
As with other basic operations in Excel, the spell check is only applied to the current selection. I.e.:
If you select multiple worksheets, all of these are checked.
Click on the Spelling option, to perform the spell check. This is located in the 'Proofing' group, on the Review tab of the Excel ribbon (see below).
If there are no spelling errors in the checked range, a message box will pop-up, with the message "Spell check complete. You're good to go!".
If Excel does find some spelling errors, you will be presented with the 'Spelling' dialog box (see below).
The 'Spelling' dialog box highlights the first spelling error that it has found and gives you possible alternative spellings for this word. From this dialog box, you can request that Excel takes one of the following actions:
Once you have specified what is to be done for the first highlighted word, Excel will move onto the next word that it believes may be mis-spelled. This is repeated until the entire range has been checked.