How can i fix execution plan of stored procedure or user defined function in SQL Server 2005

I have SQL Server 2005. I want to know how can i fix and change execution plan of stored procedure or user defined function?

Also, want to know, if already I fix excution plan, when automatically it gets changed, and what to do to avoid it.

I have stored procedure, which run several times in an hour (lets say 500-800 times in an hour), i have observered that execution plan gets changed frequently. So, if i can fix execution plan, than i can take maximum advantage of indexes i created.
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to change the execution plan, you'll need to either change the query OR include query and/or join hints.  You can also use plan guides

post your procedure code.
ferikAuthor Commented:
I have attached procedure code. basically this procedure works like notification to different application to find out further steps require to take or not.

Please advice.

Are there indexes on the LCode, BID,SID and stID fields?

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ferikAuthor Commented:
Yes, there are indexes on all those fields. Please note that all indexes are seperate. No index has more than 1 column.
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Microsoft SQL Server 2005

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