vsmathur(dot)co(dot)in opens newsletter(dot)wordpress(dot)com always – Help!

I have my website at vsmathur(dot)co(dot)in and have somehow managed to mix-up the DNS Records in a way that newsletter(dot)wordpress(dot)com always opens when I open the former site. Anyone can help? Even the wp-admin command opens up the latter website instead of the former. I am told I should get a professional wordpress expert to correct this for me, but am thinking that I am only a few inches away from doing this myself, considering that the dead website was made alive by me, whether by accident or design, I do not know.

So any kind of guidance would be very very welcome, thanks in advance. CA Vikram Shankar Mathur