You will be more likely to find help if you e-mail the MNE or EEGLAB mailing lists. When you do that, you should explain exactly what your problem is (what you are trying to accomplish, what code or commands you have tried, and what happened that was different from what you wanted).

Your problem is not clear. However, the following code may help you to use text file in matlab.

A = importdata('text_file_name.txt');

B=A.data;

plot(B)

Before plotting your raw data you have to select the specific channel/electrode