to insert any program/code block/screen etc. into a pre-existing tape (or disk etc.) image file, open the latter into ZX-Blockeditor, click on the row where you want to insert the other program/code block/screen etc., in order to highlight it, then either select Tools > Import file... or click on the first icon on the vertical toolbar on the left, just below the New file icon. A dialog window will open, and you will be able to select the file to import. Then another dialog window will appear, where you will indicate which blocks - usually the header and data ones - will be imported. Select them, click on OK and hey presto!, the imported data will appear at the row you previously highlighted.