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Yes, you can limit which pages your wfchannel block appears on. You'll need to log into your Administrator Panel on your website, and then go to System Admin > Blocks and find the block you created.
After finding this block, select "Edit", and you will be taken to the "Edit A Block" screen.
There you will see a list of attributes for your block and a window called "Visible in", which is where you choose which pages you want your block to show up in.
You can select multiple, specific pages you want your block to show up on by holding down the CTRL button on your keyboard and then clicking on which pages you want.
(Im using XOOPS 2.0 so my instructions may differ slightly if you are using a version other than that.)