You can add or remove logos only if you have a paid plan. Since your survey account is in the free plan, the option to remove the logo is disabled. Compare our various plans here.
The redirect option is available on the Survey Settings section. In the Survey end page section, select Redirect to a new page, then click Save Settings to save the changes. But, this feature is available only with the paid plans of Zoho Survey. You can make use of this feature if you had already selected the redirect option when your account was in the free Enterprise trial.
Sorry, it is not possible to display or refine questions on the following page (page one) using the responses to questions on the previous page (page two).
Sorry, it's not possible to add 'Other (please specify)' option in question logic as it's not a pre-defined choice for multiple choice questions.
However, as a workaround, we suggest you enter 'Other' as a choice in the question and add a Single Line question and type in 'Please specify'. After adding the question, add a question logic with If = Other, and for Then Show Questions, select Please specify (and other questions based on your requirements).
Questions set in question logic will be displayed in your survey only if the set logic matches. Also, you cannot view how your logic would work in the Preview mode. So make sure you publish the survey to make use of this feature.
Sorry, it's not possible to make edits to Zoho Survey's default Thank You page. However, you can make use of the other options available in the Settings tab to customize the survey end page. Read more here.