cronjob/tab newbie help

hello i dont know a thing about cron so... i'm trying to do a cron job it says i have to do the following
1. crontab -e
2. 0,30 * * * * nice /pathto/pnlogdl.pl

first are the stars mean my ip or something? or i just leave it as it? also it opens up a bunch of lines how do i insert that line(2). save and check whether is working? see whether it'll auto update

thanks in advance

btw this is psychostats for counter strike

 

 

 

 

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