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Define multiple columns for y-axis

I’m new to this and I’m trying to create a simple bar chart with column 0 as the X-axis and multiple columns as the Y-axis. Looking at the tutorials, I should be able to specify multiple columns as the Y-axis, but I am only able to select 1 column as the Y-axis, which won’t work for me at all.

Attached is the screen of what I see.

Please help. Many thanks in advance