I have crated a computer with its name in the account but I think it is not simple as so, isn't it? Should just my client find my BAM account automaticly without me doing anything?

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http://jagf.phpnet.us/forum/

You have to let the client use BAM!, it's no automatism. Do so just after the installation and first start of BOINC, before you connect to any project. After the first contact the new puter should be made to attach to all the preselected projects.

But there is 1 prob. I have used boinc for a month but i have used BAM for 1 day. But I have my points in the stats but I have no computer in the host list.

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http://jagf.phpnet.us/forum

BAM! and BOINCstats are 2 distinct features, both maintained by Willy on the same server, but not absolutely interwoven.

What host list are you talking about?
There is the one from BAM! in the upper left menu and there is the one from the stats, somewhere in the middle of the lines on the combined stats page. The former one is only created once you connected your puter with BAM!, the other is fed by the stats-XML from the projects.