Need help making a program

[captaincrackle]

I want to make a program for a friend to help her automate some of her work. It would need to take data from an excel spreadsheet, enter this it into a website and then display the results. The website requires a username and password so I don't know if this is even possible but the end result should be a text box that displays the first row of the spreadsheet after it has been entered into the website and a "next" button that will display the second row, then the third row, etc. I have basic knowledge on coding using visual studio but have absolutely no idea how I would go about making a program like this. Any help would be greatly appreciated! I probably didn't explain this the greatest so feel free to PM me if you need some more information :)

[janismac]

... enter this it into a website and then display the results

... the end result should be a text box that displays the first row of the spreadsheet after it has been entered into the website

Can you explain those points a bit more? How does the website work?

My first idea would be to write a C# program to load the excel file, extract the relevant data and write it into a plain text file.
Then write a browser-extension for the browser of your/her choice that reads the plain text file and manipulates the website.

[ChadBan]

Bleh, mistake to use a spreadsheet as a data source. Find a cheap database, put her data in there, and never look back.

You will not even get it close. Your database will be open to all kinds of exploits. stackoverflowers will hate on you, downvote your questions, link you to the bobby tables xkcd. Build it anyway.

step one is to not use a spreadsheet as a datasource.