How do i replace/change color in Photoshop 7?

I have drawing i want to scan into photohop 7. Its drawn with a BLUE pen, but i want to change the blue to BLACK (i only have a blue pen). How do i replace or change the color?





I know i can use the ';burn'; tool to change it, but isnt there a faster way?How do i replace/change color in Photoshop 7?
Levels, curves, or replace color would be faster than burn.How do i replace/change color in Photoshop 7?
I don't know what Burn tool does. But to change the color of your tool:


first, make sure Swatches from the Window option is checked, so you can see it on the right side. There, you can choose the color you want.





;)
Go to Hue/Saturation.


[Shortcut way is Ctrl U]


Then mess around with the bars until you get your color.