First check if mikrotik itself sees internet by pinging and tracerouting some addressees form MT. If it does not work, your internet connection does not work. If it does work, then you haven't set masquerading properly, or there is problem with local network configuration. Also check if local network sees MT properly.

Do not just complain it does not work. At list say show your configuration.

Try this one.
The rule should look like this if you issue the print command.

[admin@MikroTik] > ip firewall nat print srcnat
Flags: X - disabled, I - invalid, D - dynamic
0 X chain=srcnat out-interface=ether1 action=masquerade

The interface ether1 in this example is connected to the Internet. Remember to always add the rule to the outgoing network interface.

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or try with this code:
that's nat code 192.168.0.0/24 example subnet for.

regards
Hasbullah.com
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thx all... its workin...