How To Remove "POWRED BY BLOGGER" From Bottom Side of Blog

Go in to 'Edit HTML' (under the 'Design' tab).

Search through the HTML for ".footer-outer"
after then  add HTML bellow "footer-outer"

/* Footer
----------------------------------------------- */
.footer-outer {
  margin: -$(shadow.spread) 0 -1px;
  padding: $(shadow.spread) 0 0;
  color: $(footer.text.color);
  overflow: hidden;
display: none
}

AFTER then save template.