You can change these options through a command or through the options dialog. Commands are quicker.
To automatically ignore all DCCs simply type
/sreq ignore. To make the DCC send "ask" box to pop-up, so you can choose whether to accept a DCC or not, type
/sreq ask.
If you wish, you can choose to set up a "trusted" list so you can auto-get off of your friends. Simply use the /dcc trust command. See
/help /dcc for further help.
All of the above options are accessible, and can be edited, in mIRC options via:
ALT+O > DCCGood job for checking up on how to stay safe. You may find
this thread useful for tips on staying safe, and programs which will help you do just that.
Hope this helps
Regards,