No need to apologize, that's what this forum is for.
VARstationary isn't a column in the data frame that's read from the .csv file. If you're having an issue with VARstationary, then it has nothing to do with the csv.
If you're having an issue with the columns in the csv, please read it as a data frame df, then execute this command sapply(df, class). That will tell you the data types of all the columns. It looks like column 1 should be a date type and columns 2, 3, 4 should be numeric.
.csv isn't actually an Excel file. Excel can open .csvs, but Excel files have the extensions .xlsx. If you open a csv in Excel and then make some changes to the format, and save it as .xlsx, then the changes will be saved in the .xlsx. If you make some changes to the format and save as .csv, the changes will be destroyed. That's because .csv is a plain text file. It contains no information about the data types of the columns. You can open it in notepad in Windows and see for yourself the complete contents of the file. What you see is what you get. There's no "metadata" or anything with additional information about the data types, cell colors, cell text formatting, etc.