Click to watch the tutorial

Click the blocks button

Ensure your blocks look like this.

Move wait 1 seconds block into glide procedure.

Drag a call and wait block

Select glide in call and wait block.

Duplicate random integer block by right clicking and selecting duplicate.

Click duplicated block into Value : speed area on call glide and wait block.

Duplicate and move the clone block in call glide block to the Sprite classs1 : clone area in the call glide and wait block.

Click Play with call glide and wait procedure.

Notice that the call and wait procedure waits the 1 second in the glide procedure before cloning another sprite.

Now, swap the call glide procedure in place of the call glide and wait procedure.

Click Play with call glide procedure.

Notice that the call procedure does not wait for the glide procedure to finish before calling it again.