MEME need a specific matrix for input. The software gives a list of utilities for conversion matrix. For example, you can convert jaspar PFM to MEME matrix input to use with FIMO and find motifs in a sequence.
CISBP-rna http://cisbp-rna.ccbr.utoronto.ca/ let access a list of PWM matrices but I don't see in MEME a conversion Tool for that format. So I was wondering how to use them with fimo or an another tool.