If you have just fitted a new fully charged battery then remove the connection on the battery post and clean with a wirebrush
as the post have a protective coating that has to be removed with a brush or fine sand paper .
Check the clamps are also clean .
If after connecting the battery and still the same problem check with a volt meter the battery voltage you should have with a new battery fully charged 12.6 volts .
If you have the 12.6 volts then with the voltmeter still connected have a second person try and start and take note of the volt reading ,if the readings drop below 9.6 volts the new battery is bad if the voltage stays above 12 volts check the starter motor wiring circuit if good replace the starter motor .
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Kind regards Greg.