I am using magento community edition version:188.8.131.52 with theme Grenada. I am not able to show up custom blocks in frontend. According to Internet resources there should a path System>Permissions>Blocks to add my custom block but there is no such path here.
Can anyone guide me through this please?
Yes, you can change template of any block type, as follows:
You can use it in layout xml file, cms page:
You should use default template functions in your own template files. You can change design except business logic.