Hardest but best method
For the Block Kit to work with a 3rd party theme some files need to be added. Here we will add the files to whole theme. This method is fast to download/upload and only has to be done once per theme. It is a little more tricky to set up than other methods.
Open up the theme
1) Right click theme you want to add Block Kit to, here we are adding it to the Silk Theme
2) Click 'Reveal Theme Contents in Finder...' This will open a finder window with the contents of the theme
Add the assets file
1) Locate the 'Add_to_assets' folder. This is inside the 'assets' folder inside the file you downloaded from rapidweaver.org.
2) Drag this folder into the 'CSS' folder in the theme you just opened up.
Open the index.html file
1) Right Click index.html
2) Open it with your favorite html editor. Here we will use Coda. You can get a free demo of Coda from the developers site.
Edit the html file
1) Open the 'html_code.txt' file which is inside the 'assets' folder inside the file you downloaded from rapidweaver.org.
2) Copy and paste this text into index.html
- It must go somewhere between the word '<head>' and the word '</head>'
3) Save this file.
Test it is working
Create a blocks page with the edited theme applied. Make sure you delete any header text left over from the page by page method. Drag in a rounded block. Hit preview and hopefully it will show up. If the menus do not open properly, make sure the header is cleared of any version of easy or medium snippets.