Simple. All your options are listed in the support section.

The short answer is: you can either refer to our documentation (as you are now) or send us a support email.

Umami is mainly a wallet--meaning means to store tez--as opposed to a market or exchange.

In order to buy tez, you need to join an exchange, deposit fiat, and exchange it for tez.

Once you have tez, you can withdraw it into your Umami account; which is of course preferred security-wise, as your installation of Umami is under your sole control, whilst the exchange--holding your tez on your behalf--is subject to risk and may lose your funds. There are many historical instances of this occurring. As they say in crypto: “not your key, not your coin.”

Fees are (i) not charged by Umami, and (ii) not determined by Umami. They are set by the Tezos protocol. Umami gets the fee amount to pay by simulating an operation on the Tezos network prior to submitting the actual operation.

Fees can be manually set by the user in the advanced options, but this is risky as it could lead to failed operations if the fees are insufficient.

A more detailed description of how fees work in Tezos is found in this highly-recommended read.

Sure. There are two ways you could do this.

First, you can simply transfer your tez from your other wallet account(s) to your account(s) in Umami.

Second, you can export your key, which will provide you with a backup phrase (usu. 24 words, but other phrase lengths are supported), which you can then import into Umami. In which case, no transfer/transaction is needed--in fact, you can keep using either or both wallets to access the same account(s).

For the most part, the most crucial aspect is for you to protect and safekeep your recovery phrase.

The main ways you could lose your funds is (i) someone gets your private key or recovery phrase and takes over your account; or (ii) you lost your private key or recovery phrase and hence can no longer access your own account.

The first, by theft, can happen if your private key or recovery phrase is made accessible to an unauthorized and malicious person. This is why you should not keep your recovery phrase in digital form, where it could be accessed by a hacker and more easily copied. Otherwise, if you keep your recovery phrase on paper, similarly it must be kept safely away from malicious hands (or eyes).

The second, by losing your primary key or recovery phrase, can happen if you simply don’t backup your recovery phrase or that you misplace your recovery phrase backup. If you no longer have a mounted installation of Umami nor a backup of your recovery phrase, your funds are inaccessible.

If your funds are either inaccessible or stolen, there is no technological recourse (you should alert the police of course if your funds are stolen). Transactions are irreversible. Private keys are practically impossible to recover without the recovery phrase.

The recommendation is to keep a backup of the recovery phrase on paper and in a safe place that is both located somewhere nobody else knows and is inaccessible/protected by intrusion.