It is necessary for three steps to arrange the corner of the bottom.
This page explains to the first step.
First, you bring one cube to the right position like this illustration.

Is there not the corner cube which the direction matches? It's OK. You bring the cube which "the color combination matches" to the right position like this illustration.

1 corner which was arranged in this way is called " the reference mark " for convenience.
You see 3 corners which excluded " the reference mark ". You click the illustration which becomes a right combination at each corner.
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"The reference mark" is top at this illustration.

"The reference mark" is top at this illustration.

In this case, please change "the reference mark". You will be able to find the other case(clockwise or counterclockwise).
In this case, please work the case1(clockwise case) once, and change "the reference mark". You will be able to find the clockwise case or counterclockwise case.