Increasing PHP memory

I literally only have like 15 unique visitors to my site a day, and I keep getting memory errors.

I am running a wordpress site (some vital plugins) and a vbulletin forum. I tried following steps indicated on dreamhost site and it still doesn’t seem to be working.
[went into my sites ftp/ added a .php folder/ added a 5.3 folder/ added a “phprc.” file with the text "memory_limit = 128M "]

Is this right? I am on shared hosting. Some help will be greatly appreciated.

You need to submit a ticket to DreamHost. They may need to force a reset of your apache instance.