Push the bug and make small corrections to the WordPress theme

Good afternoon. The site www.petsfinder.ru on the WordPress CMS what needs to be done.
1. Now there is an annoying bug on the site, when the user clicks on the button to submit an ad > fills out the ad > the registration form crashes > the user registers > the filled fields of the form fly off and you have to fill them out again.
You need to do what: Hang on the button add ads, the function of checking login launch of the window with registration and login, after which already redirect to the form.

2. You need to reduce the number of steps. When the user fills out the form, he has to click on the same button 3 more times to be redirected to the ad at the end. Reduce steps to 1.

For more details, see the TK, in the attachments.

Conditions:
1. I give full access to the server, I do not give access to the wordpress admin panel.
2. Payment is fixed, without bidding - 3000 rubles after demonstrating the result.
3. Be sure to look at the site www.petsfinder.ru before your response. If you are not sure that you can cope, it is better not to waste each others time. Thank you.