Open all of them and add some lens blur. It’s not not an obligation but it looks nice in the final result. These are my settings

Next, go to File>Automate>Merge to HDR

Browse to the folder you saved the exposures in and click OK. Photoshop will now batch-edit the seven exposures into an HDRI

When it is done, it will pop up an EV (exposure value) dialogue. Set the lightest Exposure to 3, the next one to 2, and so on to 1, 0, -1, -2 and -3.