How to remove artifacts from EEG signal using fastICA algorithm?

I have an EEG signal where a total 300 trials, each trial has 795 instances for 64 channels. EEG data size becomes 795x64x300. I want to remove artifacts from those signals using the fastICA algorithm. I already downloaded the fastICA package and applied the firstica function where the independent components were 64. In the output, I got independent components, mixing matrices, and unmixing matrices. At this point, I can not understand How to use those outputs to remove artifacts.