How to connect to two applets

When we press a button in one applet next applet should show up
eg>

This are two applet for example
#-Link-Snipped-#
#-Link-Snipped-#
if i press enter here then it should go to next applet

😲please reply you engineers
and if you have time then try to reply to other thread also which i have created.
which is in full detail.