I am using magento community edition version:1.9.1.1 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?
Have you installed SUPEE-6788 patch on you Magento installation?
Yes, you can change template of any block type, as follows:
You can use it in layout xml file, cms page:
template="my_template/file_name.phtml"
Good practice:
You should use default template functions in your own template files. You can change design except business logic.