Issue in changing dimension of a footage from iPhone

Hi,

I edited a video footage from iPhone with these dimensions: 1830*1014 and exported it. Now I want to edit the video from the new downloaded version. But when I am taking the file in a new project, the file is not working well. 

Please suggest how to change the dimensions into 1920*1080 dimensions that I have to merge with another footage of 1920*1080 dimension and edit for a Podcast together. 

Thanks,

Avadhut