cursor woes

so i'm trying to change my blog cursor to a different one but somehow this html code is different from my previous blog's so now i  can't figure out where the heck to add the code to change my cursor. and all those online tutorials are not helping either ): i'm a bit worried to screw over my blog's html if i anyhow just add so.....

if anyone reads this and is willing to help a computer illiterate like me pls comment and help a poor soul out (':

Hope™