How to complete an Excel file received by email?

Hello,
It is read-only.
In order to work on it, you need to save it...

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If you differ from me, you enrich me ;-)

Yes, that's what I did!!!! But right now, I'm updating at the same time, so do you think it might not work because of that! Or does it have nothing to do with it!
I'm using the informal "you" and I hope you don't mind!

I've tried again and no, it doesn't work either.

I think after reflection that it's because I might not have Excel on my computer anymore. Let me explain: I have it in my menu by clicking on start, but even when I go there directly, it doesn't work. It's possible that with my computer, I had an Excel offer that was valid for about 15 days and that the offer expired a long time ago, knowing that I don't use Excel at all; I use the spreadsheet from Open Office when I need it, so I wasn't too concerned about it. But having received an Excel document very recently, obviously, I looked into the subject. I hope I was clear, but in short, I think I need to download Excel and give it another try!!! And if it doesn't work, well that's too bad!!!!! Do you think that might be a good solution?
Thank you for your replies, that's nice!

I forgot, hello Abel!!!!!!!!